Centrifugal machine.



No. 637,258. Patented Nov. 21,1899.. f L. Hmr. GENTRIFUGL MACHNE.

l fr. 4 (Applcltion led June 18, 1899.) fuo'uudel.)

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Vm: Vminus-Pneus co, Primo-mw UNITED STATES PATENT EEICE.

LUDWIG HIET, or GEEvENEEoIoH, GERMANY, AssIcNoR To THE MASCHINENEABEIK GEEvENBRoIoH, or SAME PLACE.

cENTizn-'UGAL MACHINE?.

k;-; I In. i` rr SPECIFICATION forming part of Letters Patent No. 637,258, dated November 21, 1899. Atpiicaimi het rune 13, 1899. semina. 720339. (nommer.)

syrup by whizzing in the centrifugal apparatus is further Whitened by the action of stea thereon.

The invention consists in devices by which the steam is admitted into the drum with the greatest possible regularity and equality of distribution in order that it may penetrate the sugarwhich has just been Whizzed with the greatest thoroughness and equality of action, thereby whitening or bottoming itt. e., separating and removing the syrup which still remains in, on, and among the sugar particles in a highly-efficient and regular manner.

In the accompanying drawing a centrifugal 'apparatus embodying my invention is shown in vertical axial section.

In the drawing, T is the basket or drum,` the bottom U of which is double, with space between. This bottom may be provided with flap valve or valves U' for removing the treated sugar through said bottom.

R is the outer curb or casing, which can be closed bya cover S. The bottom of the drum or basket bears a vertical' cone K, in which the driving-spindle K is fixed. This spindle is threaded at its upper end. On this bearing K there rests a cover-plate or packing-plate C, which is made fast by the nut Q upon the spindle-thread and which also serves to hold the spindle in place in Vits cone.

The device for the regular and thorough admission and line distribution of the steam by which the sugar is whitened after the first whizzing process is arranged on and around the spindle-cone K. It consists of a conical outer shell A, which is properly fastened to the bottom of the drum or basket onto the flange K2 of the spindle-cone K and whichv preferably extends as high as the upper margin of the drum. Within this vconical outer shell is a second and shorter one, B, `Closed above and leaving a space between thecone A and itself, as well as one between itself and*l the spindle-cone K. The space between ,the spindle-cone K and the shell B is closed at top by the cover-plate/C. This inner cone B does not reach to the bottom of the drum or basket. Between and connecting the two cones orshells Aand B,and extending through the space or jacket I between the same, is a number of axially-perforated stay-bolts or conduits D, suitably fastened. These are preferably bolts drilled throughout their entire length, and the drill-holes therein form a steam connection between the inner space II, which exists between the spindle-cone K andl the inner shell B and the interior of the driver or basket T,

The spaces I and II are put in communicavtion with the space M in the double drum-bottom by means of the channels F, which are shown as passing through the bottom of the drum or basket T and through thel spindlecone ilange K2.

Into the interior of the shell A and in the center of the drum-cover there leads the vertical steam-inlet pipe G.

The device operates as-follows: After the syrupI has been as far as possible' removed from the sugar in the drum or basket by centrifugal action steam from the pipe Gis led by way of the outer jacket or space I, the annular opening between the two jackets or spaces, the inner space II, and the drill-holes in the radial stay-bolts D int-o the still-revolving drum. In its downward course through the space I it heats lthe jacket-shells Aand B. The water carried with the steam and the water of condensation flows downward and outward through the channels F into the space in the double bottom M of the drum or basket and thence is discharged through suitable channels-as, for instanoe,with the syrup which has been Whizzed or driven by centrifugal action from the sugar. The steam passes in a dry condition through the drill-holes in the numerous stay-bolts D into the drum or basket and there acts on the sugar mass.

The advantages of this whitening device are as follows: The steam is regularly intro- IOG duced into and finely distributed through the entire inner basket or drum wall, the result of which is that the sugar in the drum is thoroughly and equally whitened throughout its entire mass. The steam reaches the sugar in a dry condition, as the water ot' condensation has by the combined action ot' gravity and centrifugal action been thoroughly removed therefrom. There is, therefore, a notablysmaller quantity of sugar dissolved in the steaming or steam whitening process and less steam used than where this separation of the water and drying of the steam does not ensue.

The action of whitening sugar by steam is materially facilitated by the above device, the drum being kept warm bythe steam and the bottom of the drum by the oit-flowing warm water of condensation, tbc.

Having described my invention, what I claim, and desire to secu re by Letters Patent, 1s-` 1. In a centrifugal apparatus for whitening or otherwise operating upon sugar, the combination of a basket, a spindle, a device for admitting steam into the basket, consisting of a double casing arranged around the spindle in the drum or basket with a space between the inner casing and the spindle, conduits spacing the walls of the double casing apart and forming connections between the same, a steam-inlet pipe communicating with the space between the two shells of this double casing, whereby steam may be admitted rst into the space between the shells of the double casing, then into the space between the inner shell of the double casing'and the spindle and thence through the hollow conduits into the basket or drum.

2. In a centrifugal apparatus for whitening or otherwise operating upon sugar by means of steam,the combination ofa basket, an outer conical shell A rising from the bottom of the basket, an inner conical shell B surrounded by the outer cone, closed at the top and open below, a spindle K supportingr the inner cone, a plurality of conduits D spacing the said two cones apart and connectingthe sameand forming a steam-passage from the inner cone to the outside of the outer cone, an inlet-pipe G for discharging steam into the outer cone, where by the steam will pass through the space between the two cones, around the lower edge of the inner cone into the space between the inner cone and the spindle-cone and thence out into the basket through the conduits and means for draining off the water from the interior of the outer cone.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 16th day of May, 1899.

LUDWIG HIRT.

Witnesses:

CARL KNooP,

HERNANDO DE Soro. 

